FIEBAG, J. (1988): Contributions to the geology of the Azuara structure: Geological mapping in the area between Herrera de los Navarros and Aladrén and SE of Almonacid de la Cuba, and special investigations of the breccias and breccia dikes in the light of the impact origin of the Azuara structure. – Doctoral thesis, Univ. Würzburg, 271 pp., Würzburg (in German).

Johannes Fiebag († 1999) has markedly pioneered the geologic work in the Azuara impact structure. Several pictures of this homepage have either been taken by himself or have been taken from rocks of his personal collection.